High-precision laser microfabrication is a way exactly where products are processed and modified on a microscopic scale. This method demands a laser source that will create extremely focused and exact beams of sunshine. The 266nm wavelength is especially well suited for this because of its limited wavelength, which makes sure that the laser beam is usually concentrated to a very compact place sizing.
The team velocities of the basic and next harmonic pulses are diverse, even though phase-matched, as well as the magnitude on the group velocity mismatch will depend on the crystal Houses and also the optical frequencies during the pulses.
Although this general guideline offers a standard pattern, It's not necessarily a quantitative Investigation of LIDT vs wavelength. In CW apps, For example, damage scales extra strongly with absorption during the coating and substrate, which isn't going to necessarily scale nicely with wavelength.
Beam diameter can be crucial that you know when evaluating destruction thresholds. Though the LIDT, when expressed in units of J/cm², scales independently of location dimensions; significant beam measurements usually tend to illuminate a bigger quantity of defects which may lead to greater variances in the LIDT [4].
A number of variables can have an effect on the performance of BBO crystals. These consist of temperature, humidity, and the quality of the incident light. Appropriate managing and storage will help maintain the crystal’s performance. Temperature can affect the section-matching ailments of BBO crystals, which subsequently affects their effectiveness in frequency conversion purposes.
Thorlabs expresses LIDT for CW lasers being a linear electricity density measured in W/cm. During this routine, the LIDT given as being a linear power density may be placed on any beam diameter; 1 will not ought to compute an adjusted LIDT to adjust for adjustments in location sizing, as demonstrated via the graph to the proper. Common linear electricity density could be calculated utilizing the equation under.
Their significant damage threshold and exceptional thermal steadiness make them appropriate for use in superior-energy laser techniques, while their large transparency selection enables them to operate using a wide array of laser wavelengths.
This kind of capacity is a must have in scenarios where a selected light frequency is needed, although the source doesn’t Normally provide it. By employing BBO’s properties, scientists and engineers can properly “tune�?their gentle sources to wanted frequencies.
Pumped because of the fourth harmonic of a Nd:YAG laser (at 266nm), a tunable OPO with signal wavelength assortment in between 422nm and 477nm has been noticed by angle-tuning a kind I BBO crystal. Pumped by a 1mJ, 80fs Dye laser at 615nm, the OPA with two BBO crystals yields over 50µJ (highest one hundred thirtyµJ),
The temporal stroll-off of the slower pulse with respect towards the quicker might be a substantial portion of the pulse duration. This is illustrated in Determine 22.
This here calculation assumes a uniform beam depth profile. It's essential to now alter this Strength density to account for hotspots or other nonuniform depth profiles and about calculate a highest Power density. For reference a Gaussian beam typically has a highest Electrical power density that may be twice that on the 1/e2 beam.
Beta Barium Borate (BBO) crystals have taken the earth of photonics by storm. The most spectacular components of these crystals is their pioneering job in 266nm technology.
The 2nd harmonic gentle is then polarized parallel to the plane. Angle tuning adjusts θ which is performed by rotating the crystal across the Y-axis.
Last of all, spectroscopy, the review of interactions between make a difference and electromagnetic radiation, considerably benefits within the 266nm generation. In spectroscopic programs, distinct wavelengths of sunshine interact in another way with components, furnishing a spectrum that may be analyzed to ascertain the fabric’s properties or composition.